I realize it's off-topic but it is a 2-cycle engine and the issue may pertain to saws. I'm working on an Echo PB-251. It has one of the rotary carbs I hate if they don't run well - no standard high-low-idle settings. The issue is this. The max RPMs I can get is about 55-5600, spec says should do 7000 or so. If I obstruct the blower tube, RPMs do go up to 7-8000. The arrestor screen is spotless but it does have a cat in the muffler.
I'd appreciate any suggestions about what might get me the missing 1500 RPMs. Thanks!
I'd appreciate any suggestions about what might get me the missing 1500 RPMs. Thanks!